CN217047462U

CN217047462U - Sheet conveying caterpillar of plastic sheet pneumatic thermoforming machine

Info

Publication number: CN217047462U
Application number: CN202220417178.6U
Authority: CN
Inventors: 翁龙斌; 黄林畅
Original assignee: Shantou Dacheng Environmental Protection Precision Machinery Technology Co ltd
Current assignee: Shantou Dacheng Environmental Protection Precision Machinery Technology Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-07-26
Anticipated expiration: 2032-03-01

Abstract

The utility model relates to a sheet feeding caterpillar track of a plastic sheet pneumatic thermoforming machine, which comprises a strip-shaped caterpillar track main body, an upper pressure plate, an upper cooling water pipe and a lower cooling water pipe; the caterpillar track main body is provided with a forward section chain cavity and a return section chain cavity; the upper pressure plate is arranged on the upper side of the caterpillar track main body through a plurality of elastic guide assemblies, each elastic guide assembly comprises a compression screw, a compression spring, a connecting through hole formed in the upper pressure plate and a locking screw hole formed in the top surface of the caterpillar track main body, and a screw rod of each compression screw penetrates through the connecting through hole from top to bottom to be in threaded connection with the locking screw hole; the compression spring is sleeved on the screw rod of the compression screw, the upper end of the compression spring is in contact fit with the head of the compression screw, and the lower end of the compression spring is in contact fit with the top surface of the upper pressure plate; the upper cooling water pipe is arranged on the upper side of the upper pressure plate, and the lower cooling water pipe is arranged at the bottom of the caterpillar track main body. The piece-feeding caterpillar track is simple in structure, low in cost, good in cooling effect, capable of meeting wider production requirements and better meeting market requirements.

Description

Sheet conveying caterpillar of plastic sheet pneumatic thermoforming machine

Technical Field

The utility model relates to a caterpillar, concretely relates to mould piece air pressure thermoforming machine send piece caterpillar.

Background

The plastic sheet pneumatic thermoforming machine is a device using solid-phase plastic forming technology, and is characterized by that it can heat the plastic sheet material of crystallized polymer to below crystallization melting temp., and make it pass through the processes of die core drawing and compressed air modification and shaping so as to obtain the invented plastic thin-wall container.

The traditional plastic sheet pneumatic thermoforming machine is generally composed of a sheet feeding device, a sheet conveying caterpillar track device, a heating device and a forming (blanking) device, wherein a plastic sheet enters from the sheet feeding device, is conveyed by the sheet conveying caterpillar track device, is heated and softened by the heating device, is formed (blanked) by the forming (blanking) device, and is sent out of the forming machine to complete a one-step forming process. The sheet feeding caterpillar track device is used for conveying sheets entering a machine to be heated through a heating electric furnace and then accurately conveying the sheets to a forming (blanking) device for processing, generally, chains are adopted to be matched with the caterpillar track to convey plastic sheets, two sides of each plastic sheet are hung on the two chains respectively to convey the plastic sheets, and the caterpillar track plays a role in supporting the chains and keeping the chains flat in the conveying process; when the plastic sheet is formed, the plastic sheet needs to be heated by radiation through an electric furnace, and when the plastic sheet is heated, the chains and the caterpillar tracks are heated by partial radiation of the electric furnace or heat transfer of the plastic sheet, and the chains and the caterpillar tracks need to be cooled by water (or other cooling liquid) so as to prevent the two sides of the plastic sheet from being softened due to overhigh accumulation temperature of the chains and the caterpillar tracks.

However, in the past, due to the limitations of production equipment, there are only two types of sheet feeding tracks commonly used in the market: the first type is an aluminum alloy drawn caterpillar which is formed by drawing an aluminum alloy through mold opening, although the aluminum alloy drawn caterpillar has a simple structure and a price advantage, the structure of the aluminum alloy caterpillar is limited by material performance and a special shape required by the caterpillar, secondary processing cannot be carried out after the inner wall of the caterpillar is drawn and formed, and complete coverage cannot be guaranteed by surface oxidation treatment, so that serious scraping can often occur when a load is large (even if a sheet is used for large thickness), so that the aluminum alloy caterpillar cannot adapt to wider production conditions, and tests show that the caterpillar can be easily scratched due to overlarge pulling force when a sheet with the thickness of more than 1.5mm is used for production, powder pollutes the sheet, and the caterpillar can be seriously crushed to generate deformation; the second type is to assemble a plurality of scattered parts into the required steel assembly structure caterpillar track by the assembly form, although the steel assembly structure caterpillar track can meet the wider production requirement, the structure is complex, the processing is complex, the production cost is higher, and the cooling effect is poorer. Therefore, the two film feeding caterpillar tracks have certain defects, the production requirements of current customers are difficult to meet, and the improvement is urgently needed so as to better adapt to the market requirements.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a mould piece atmospheric pressure thermoforming machine send piece caterpillar track is provided, this kind send piece caterpillar track is simple structure not only, and is with low costs and cooling effect good, can adapt to more extensive production requirement moreover, adapts to the market demand better. The technical scheme is as follows:

a sheet feeding caterpillar of a plastic sheet pneumatic thermoforming machine comprises a strip-shaped caterpillar main body; the caterpillar track main body is provided with a forward section chain cavity and a return section chain cavity which penetrate through two ends of the caterpillar track main body along the length direction of the caterpillar track main body, and the forward section chain cavity is positioned on the upper side of the return section chain cavity; the method is characterized in that: the piece feeding caterpillar track further comprises an upper pressure plate, an upper cooling water pipe and a lower cooling water pipe, the upper pressure plate is arranged on the upper side of the caterpillar track main body through a plurality of elastic guide assemblies, the length direction of the upper pressure plate is consistent with the length direction of the caterpillar track main body, each elastic guide assembly comprises a compression screw, a compression spring, a connecting through hole formed in the upper pressure plate and a locking screw hole formed in the top surface of the caterpillar track main body, the connecting through hole and the locking screw hole are vertically arranged and correspond to each other in position, a screw rod of the compression screw penetrates through the connecting through hole from top to bottom to be in threaded connection with the locking screw hole, and a gap is formed between the head of the compression screw and the top surface of the upper pressure plate; the compression spring is sleeved on the screw rod of the compression screw and is positioned between the head of the compression screw and the upper pressure plate, the upper end of the compression spring is in contact fit with the head of the compression screw, and the lower end of the compression spring is in contact fit with the top surface of the upper pressure plate; the upper cooling water pipe is arranged on the upper side of the upper pressure plate, and the lower cooling water pipe is arranged at the bottom of the caterpillar track main body.

Generally, the caterpillar main body is a high-strength wear-resistant rail formed by performing surface nitriding treatment after quenching and tempering with 38 CrMoAl.

In the piece feeding caterpillar track, the upper pressure plate can move along the screw rod of each compression bolt through each connecting through hole and is limited by the head part of each compression bolt and the top surface of the upper pressure plate, so that the upper pressure plate can move up and down in the gap between the head part of each compression bolt and the top surface of the upper pressure plate; the lower ends of the compression springs are in contact with the top surface of the upper pressure plate, and downward acting force can be applied to all parts of the top surface of the upper pressure plate; the upper cooling water pipe and the lower cooling water pipe are respectively arranged on the upper side of the upper pressure plate and at the bottom of the caterpillar track main body, so that the sizes of the upper cooling water pipe and the lower cooling water pipe are not limited by the special shape required by the caterpillar track main body, the integral structure of the piece conveying caterpillar track is simpler, and the cost is lower.

When the chain conveying device works, the chain forward section and the chain return section are respectively positioned in the chain cavity of the forward section and the chain cavity of the return section for transmission, and two sides of the plastic sheet are respectively hung on the two chain forward sections for conveying. When no sheet feeding production is carried out or plastic sheets with thin sheets are conveyed, the upper pressing plate is tightly attached to the top of the caterpillar track main body under the downward acting force exerted by the compression springs of the elastic guide assemblies; when plastic sheets with thick sheets (such as more than 1.5 mm) are conveyed, if the plastic sheets are wrinkled and upwards touch the upper pressure plate, the upper pressure plate upwards floats for a certain distance along the screw rod of the compression screw on the plastic sheets, and overlarge load is absorbed by utilizing the compression deformation of each compression spring, so that the maximum application range is ensured on the premise of not scraping the plastic sheets or the caterpillar track main body, and the plastic sheets can be smoothly conveyed. The upper cooling water pipe and the lower cooling water pipe can be supplied with water (or other cooling liquid) to flow so as to take away the heat of the chain track main body, so that the chain track main body is cooled, and meanwhile, the chain forward section and the chain return section in the chain cavity of the forward section and the chain cavity of the return section are cooled; through with last condenser tube, condenser tube installs respectively in the upside of top board, the bottom of caterpillar track main part down, be about to go up condenser tube, condenser tube separates from caterpillar track main part is inside down, can make and go up condenser tube, condenser tube's size can not receive the required special shape restriction of caterpillar track main part down, can make like this send the overall structure of piece caterpillar track more succinct, and can suitably increase condenser tube and condenser tube's size down, make and send the piece caterpillar track to have good cooling effect. The sheet feeding caterpillar track combines a simple structure of an aluminum alloy caterpillar track and high applicability of a steel assembling structure caterpillar track, has a simple structure, low cost and a good cooling effect, can adapt to wider production requirements, can completely overcome the defects of other two universal caterpillar tracks on the market through actual production verification, can basically meet the production requirements of all current customers, and can better adapt to the market requirements.

In a preferred scheme, the piece conveying caterpillar track further comprises a baffle, the baffle is provided with a baffle transverse section and a baffle longitudinal section, and the lower end of the baffle longitudinal section is integrally connected with one end of the baffle transverse section; along the length direction of the caterpillar track main body, a longitudinal section of the baffle is fixed on the caterpillar track main body between the chain cavity of the forward section and the chain cavity of the return section, and a gap is reserved between the upper edge of the longitudinal section of the baffle and the edge of the chain cavity of the forward section; the baffle transverse section is fixed on the lower side of the caterpillar track main body, and the lower cooling water pipe is located between the baffle transverse section and the bottom of the caterpillar track main body and clamped by the baffle transverse section and the caterpillar track main body together. Usually, a plurality of through holes are arranged on the baffle plate, a plurality of screw holes are arranged at corresponding positions of the caterpillar track main body, and the baffle plate is locked on the caterpillar track main body through a plurality of screws. The gap between the upper edge of the longitudinal section of the baffle and the edge of the chain cavity of the advancing section can be used for plastic sheets to pass through, and the baffle not only can play a role in limiting the chain advancing section and the chain returning section, but also can play a role in bearing the plastic sheets.

In a more preferable scheme, the lower end of the longitudinal section of the baffle is connected with one end of the transverse section of the baffle through an arc transition section.

In the preferred scheme, the sheet feeding caterpillar track further comprises a water pipe pressing block, the water pipe pressing block is installed on the upper side of the upper pressing plate and surrounds a water pipe installation groove together with the top surface of the upper pressing plate, and the upper cooling water pipe is arranged in the water pipe installation groove.

In a more preferred scheme, the cross section of the water pipe pressing block is L-shaped and is provided with a vertical fixing section and a horizontal pressing section, the vertical fixing section is detachably mounted on the upper pressing plate, the first end of the horizontal pressing section is integrally connected with the upper end of the vertical fixing section, the second end of the horizontal pressing section is provided with a limiting convex block protruding downwards, and the upper cooling water pipe is arranged between the horizontal pressing section and the top surface of the upper pressing plate. During the installation, can place last condenser tube earlier on the relevant position of top surface of top plate, install the vertical canned paragraph of water pipe compact heap on the top plate again to make and go up condenser tube and be in the level and compress tightly the water pipe mounting groove that forms between section and the top surface of top plate, the spacing lug that the level compressed tightly the section this moment just blocks in last condenser tube one side, realizes the fixed to last condenser tube.

In a specific scheme, the elastic guide assemblies are sequentially and uniformly arranged along the length direction of the upper pressure plate.

In a specific scheme, the compression spring is a damping spring.

Compared with the prior art, the utility model, have following advantage:

the piece feeding caterpillar track combines the simple structure of an aluminum alloy caterpillar track and the high applicability of a steel assembling structure caterpillar track, has simple structure and low cost, can digest overlarge load by using a compression spring when a larger piece of thick sheet is used, further ensures the maximum application range on the premise of not scraping the sheet or the caterpillar track, can adapt to wider production requirements, can ensure that the sizes of an upper cooling water pipe and a lower cooling water pipe are not limited by the special shape required by the caterpillar track main body by respectively installing the upper cooling water pipe and the lower cooling water pipe on the upper side of an upper pressing plate and the bottom of the caterpillar track main body, namely separating the upper cooling water pipe and the lower cooling water pipe from the inside of the caterpillar track main body, can ensure that the integral structure of the piece feeding caterpillar track is simpler, can properly increase the sizes of the upper cooling water pipe and the lower cooling water pipe, has good cooling effect, and is verified by actual production, through the improvement mode, the defects of the other two universal caterpillar tracks on the market can be completely overcome, the production requirements of all current customers can be basically met, and the market requirements can be better met.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Detailed Description

As shown in figure 1, the sheet feeding caterpillar track of the plastic sheet pneumatic thermoforming machine comprises a strip-shaped caterpillar track main body 1, an upper pressing plate 2, an upper cooling water pipe 3 and a lower cooling water pipe 4; along the length direction of the caterpillar track main body 1, a chain cavity 101 of a forward section and a chain cavity 102 of a return section, which penetrate through two ends of the caterpillar track main body 1, are arranged on the caterpillar track main body 1, and the chain cavity 101 of the forward section is positioned on the upper side of the chain cavity 102 of the return section; the upper pressing plate 2 is installed on the upper side of the caterpillar track main body 1 through a plurality of elastic guide assemblies 5, the length direction of the upper pressing plate 2 is consistent with the length direction of the caterpillar track main body 1, each elastic guide assembly 5 is sequentially and uniformly arranged along the length direction of the upper pressing plate 2, each elastic guide assembly 5 comprises a compression screw 51, a damping spring 52, a connecting through hole 53 formed in the upper pressing plate 2 and a locking screw hole 54 formed in the top surface of the caterpillar track main body 1, the connecting through hole 53 and the locking screw hole 54 are vertically arranged and correspond in position, a screw rod of the compression screw 51 penetrates through the connecting through hole 53 from top to bottom to be in threaded connection with the locking screw hole 54, and a gap is formed between the head of the compression screw 51 and the top surface of the upper pressing plate 2; the damping spring 52 is sleeved on the screw rod of the compression screw 51 and is positioned between the head of the compression screw 51 and the upper pressure plate 2, the upper end of the damping spring 52 is in contact fit with the head of the compression screw 51, and the lower end of the damping spring 52 is in contact fit with the top surface of the upper pressure plate 2; an upper cooling water pipe 3 is installed on the upper side of the upper pressure plate 2, and a lower cooling water pipe 4 is installed on the bottom of the caterpillar track main body 1.

In this embodiment, the caterpillar body 1 is subjected to surface nitriding treatment after quenching and tempering with 38CrMoAl to form a high-strength wear-resistant rail.

The film feeding caterpillar track further comprises a baffle 6, the baffle 6 is provided with a baffle transverse section 61 and a baffle longitudinal section 62, and the lower end of the baffle longitudinal section 62 is integrally connected with one end of the baffle transverse section 61 through an arc transition section 63; along the length direction of the caterpillar track main body 1, the baffle longitudinal section 62 is fixed on the caterpillar track main body 1 between the chain cavity 101 of the front section and the chain cavity 102 of the return section, and a gap is formed between the upper edge of the baffle longitudinal section 62 and the edge of the chain cavity 101 of the front section; the transverse baffle section 61 is fixed to the underside of the caterpillar body 1, and the downcomer 4 is located between and clamped together by the transverse baffle section 61 and the bottom of the caterpillar body 1. The clearance between the upper edge of the longitudinal section 62 of the baffle and the edge of the chain cavity 101 of the forward section can be used for plastic sheets to pass through, and the baffle not only can play a role in limiting the chain forward section 10 and the chain return section 11, but also plays a role in bearing the plastic sheets.

In this embodiment, the baffle 6 is provided with a plurality of through holes, a plurality of screw holes are provided at corresponding positions of the caterpillar track body 1, and the baffle is locked on the caterpillar track body 1 through a plurality of screws 64.

The film feeding caterpillar track further comprises a water pipe pressing block 7, the water pipe pressing block 7 is installed on the upper side of the upper pressing plate 2 and encloses a water pipe installation groove 701 together with the top surface of the upper pressing plate 2, and the upper cooling water pipe 3 is arranged in the water pipe installation groove 701. In this embodiment, the cross section of the water pipe pressing block 7 is L-shaped, and has a vertical fixing section 71 and a horizontal pressing section 72, the vertical fixing section 71 is detachably mounted on the upper pressing plate 2, a first end of the horizontal pressing section 72 is integrally connected with an upper end of the vertical fixing section 71, a second end of the horizontal pressing section 72 is provided with a downward convex limiting bump 721, and the upper cooling water pipe 3 is arranged between the horizontal pressing section 72 and the top surface of the upper pressing plate 2. During the installation, can place last condenser tube 3 earlier on the relevant position of top surface of top plate 2, install on top plate 2 with the vertical canned paragraph 71 of water pipe compact heap 7 again to make and go up condenser tube 3 department in the water pipe mounting groove 701 that the level compressed tightly between section 72 and the top surface of top plate 2 and form, the spacing lug 721 of level compressed tightly section 72 just blocks in last condenser tube 3 one side this moment, realizes the fixed to last condenser tube 3.

The working principle of the piece-feeding caterpillar track is briefly described as follows:

during operation, the forward chain segment 10 and the backward chain segment are respectively in the forward chain cavity 101 and the backward chain cavity 102 for transmission, and two sides of the plastic sheet are respectively hung on the forward chain segments 10 for transmission. When no piece is fed for production or plastic sheet with thin piece is conveyed, the upper press plate 2 is tightly attached to the top of the caterpillar track body 1 under the downward acting force exerted by the damping spring 52 of each elastic guide assembly 5; when plastic sheets with thick sheets (such as more than 1.5 mm) are conveyed, if the plastic sheets are wrinkled and touch the upper pressure plate 2 upwards, the upper pressure plate 2 floats upwards for a certain distance along the screw of the compression screw 51, and the excessive load is absorbed by the compression deformation of each damping spring 52, so that the maximum application range is ensured on the premise of not scraping the plastic sheets or the caterpillar track main body 1, and the plastic sheets can be conveyed continuously and smoothly. Water (or other cooling liquid) can flow in the upper cooling water pipe 3 and the lower cooling water pipe 4 to take away heat of the chain rail main body 1, so that the chain rail main body 1 is cooled, and meanwhile, the chain forward section 10 and the chain return section in the chain cavity 101 of the forward section and the chain cavity 102 of the return section are cooled; through with last condenser tube 3, condenser tube 4 installs the upside at top board 2 respectively down, the bottom of caterpillar track main part 1, be about to go up condenser tube 3, condenser tube 4 separates from caterpillar track main part 1 is inside down, can make and go up condenser tube 3, condenser tube 4's size can not receive the required special shape restriction of caterpillar track main part 1 down, can make the overall structure who send the piece caterpillar track more succinct like this, and can suitably increase condenser tube 3 and condenser tube 4's size down, make and send the piece caterpillar track to have good cooling effect.

In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and all the equivalent or simple changes made according to the structure, the features and the principle of the present invention are included in the protection scope of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. A sheet feeding caterpillar track of a plastic sheet pneumatic thermoforming machine comprises a strip-shaped caterpillar track main body; the caterpillar track main body is provided with a forward section chain cavity and a return section chain cavity which penetrate through two ends of the caterpillar track main body along the length direction of the caterpillar track main body, and the forward section chain cavity is positioned on the upper side of the return section chain cavity; the method is characterized in that: the piece feeding caterpillar track further comprises an upper pressing plate, an upper cooling water pipe and a lower cooling water pipe, the upper pressing plate is arranged on the upper side of the caterpillar track main body through a plurality of elastic guide assemblies, the length direction of the upper pressing plate is consistent with that of the caterpillar track main body, each elastic guide assembly comprises a compression screw, a compression spring, a connecting through hole formed in the upper pressing plate and a locking screw hole formed in the top surface of the caterpillar track main body, the connecting through holes and the locking screw holes are vertically arranged and correspond to each other in position, a screw rod of the compression screw penetrates through the connecting through holes from top to bottom to be in threaded connection with the locking screw holes, and a gap is formed between the head of the compression screw and the top surface of the upper pressing plate; the compression spring is sleeved on the screw rod of the compression screw and is positioned between the head of the compression screw and the upper pressure plate, the upper end of the compression spring is in contact fit with the head of the compression screw, and the lower end of the compression spring is in contact fit with the top surface of the upper pressure plate; the upper cooling water pipe is arranged on the upper side of the upper pressure plate, and the lower cooling water pipe is arranged at the bottom of the caterpillar track main body.

2. A sheet conveying caterpillar for a pneumatic thermoforming machine for plastic sheet as claimed in claim 1, wherein: the piece conveying caterpillar track further comprises a baffle, the baffle is provided with a baffle transverse section and a baffle longitudinal section, and the lower end of the baffle longitudinal section is integrally connected with one end of the baffle transverse section; the baffle longitudinal section is fixed on the caterpillar track main body between the chain cavity of the forward section and the chain cavity of the return section along the length direction of the caterpillar track main body, and a gap is reserved between the upper edge of the baffle longitudinal section and the edge of the chain cavity of the forward section; the baffle transverse section is fixed on the lower side of the caterpillar track main body, and the lower cooling water pipe is located between the baffle transverse section and the bottom of the caterpillar track main body and clamped by the baffle transverse section and the caterpillar track main body together.

3. A sheet conveying caterpillar for a pneumatic thermoforming machine for plastic sheet as claimed in claim 2, wherein: the lower end of the longitudinal section of the baffle is connected with one end of the transverse section of the baffle through an arc transition section.

4. A sheet feeding caterpillar for a sheet molding air pressure thermoforming machine as claimed in claim 1, wherein: the piece feeding caterpillar track further comprises a water pipe pressing block, the water pipe pressing block is installed on the upper side of the upper pressing plate and jointly surrounds the upper pressing plate and the top surface of the upper pressing plate to form a water pipe installation groove, and the upper cooling water pipe is arranged in the water pipe installation groove.

5. A sheet conveying caterpillar for a pneumatic thermoforming machine for plastic sheet as claimed in claim 4, wherein: the cross section of the water pipe pressing block is L-shaped, the water pipe pressing block is provided with a vertical fixing section and a horizontal pressing section, the vertical fixing section is detachably mounted on the upper pressing plate, the first end of the horizontal pressing section is integrally connected with the upper end of the vertical fixing section, the second end of the horizontal pressing section is provided with a limiting convex block protruding downwards, and the upper cooling water pipe is arranged between the horizontal pressing section and the top surface of the upper pressing plate.

6. A sheet conveying caterpillar for a pneumatic thermoforming machine of plastic sheet as claimed in any of claims 1-5, characterized in that: each elastic guide assembly is sequentially and uniformly arranged along the length direction of the upper pressing plate.

7. A sheet feeding caterpillar for a sheet-molding air-pressure thermoforming machine, according to any of claims 1-5, characterized in that: the compression spring is a damping spring.

8. A sheet feeding caterpillar for a sheet-molding air-pressure thermoforming machine, according to any of claims 1-5, characterized in that: the caterpillar track main body is a high-strength wear-resistant track formed by performing surface nitriding treatment after quenching and tempering of 38 CrMoAl.